21402725

素因数分解:

$5^2\times {\mathrm{29}}^1\times {\mathrm{53}}^1\times {\mathrm{557}}^1$

素因数の和:649

約数の個数: 24

約数和(自身を含む): 28022760

約数和(自身を除く): 6620035

約数列:

[1, 5, 25, 29, 53, 145, 265, 557, 725, 1325, 1537, 2785, 7685, 13925, 16153, 29521, 38425, 80765, 147605, 403825, 738025, 856109, 4280545, 21402725]

約数ペア:

[(1, 21402725), (5, 4280545), (25, 856109), (29, 738025), (53, 403825), (145, 147605), (265, 80765), (557, 38425), (725, 29521), (1325, 16153), (1537, 13925), (2785, 7685)]